Spark Plugs RX7
 

Hi guys
i wanna get rx7 spark plugs and put in my 8
but i heard they re bigger so
How much longer r they?
what can i use as a spacer?
Thanks

Yep, use those rx7plugs that's what I did!

You must use a spacer or you will do damage.

If you buy them from mazsport they come with shims already attached

You only need a spacer for the trailing plugs (which don't make power so there is no need to change them unless you are using a non stock PCM).

The leading plugs you can use without any sort of spacer, as the crush washer on the spark plug spaces it out far enough.

But I don't get why anyone would want to change them to RX-7 plugs. The spark gap on a RX-7 plug is only .032 or so... considerably smaller than the .048 of the stock leading plugs on the RX-8.

Smaller gap = less spark

Less spark = less mileage
Less spark = less power

The only reason to use a RX-7 plug in the RX-8 is because you are too cheap to buy the correct plug for the car.

^^+1

i dont understand....

You can use the plugs if you REALLY want, but I'd say stay with what comes with the 8...they are there for a reason.

What's wrong with using the recommended spark plugs for the RX8? What is the benefit of using RX7 sparkplugs?

-1.3L

I guess he could have about 30 extra RX7 spark plugs and doesn't want to spend more money...?

The one and only benefit from using the RX-7 plugs is that they cost only $5 -$10 each vs $20 each for the correct RX-8 spark plug.